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Yeah, easy DIY job. I'm doing this downstairs at the moment but with 125mm PIR and plastic across the top of the joists/insulation to create an 'airtight' finish taped to the walls, etc.
The PIR insulation boards cost me about £750 for 50sqm, but it's from a store that was closing down and would usually cost more.
JonoMarshall
Thanks for the further info. Both my partner and I are pretty handy so it should be pretty straightforward. There has been some pretty shoddy work done on some of the boards previously and there is a section that was replaced at some point with sheet material so we’ll need to source some new boards and, I suspect, possibly need to do some work on the joists beneath where the sheet material is as I suspect there was probably an issue with damp or a leak